Building-scaffold



J. E. YEAGLEY.

BUILDING SCAFFOLD.

APPLICATION FILED MAYIG. ma.

Patented June 24, 1919;

2 SHEETS-SHEET I.

J. E. YEAGLEY BUILDING SCAFFOLD. APPLICATION FILQED MAY (6, I9I8.

1 ,307, 6 10. Patented June 24, 1919.

2 SHEETS-SHEET 2- JOHN E. YEAGLEY, 0F ASHLLAND, OHIO.

BUILDING-SCAFFOLD.

Application filed May 16, 1918. Serial No. 235,015.

To all whom it may concern. 1

Be it known that I, JOHN E. YEAGLEY, a

citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in Building-Scafiolds; and I do declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to building scaffolds, and it relatesmore particularly to an improved adjustable and'knock-down scaffold. The, object of the invention is to provide a simply constructed, vertically adjustable scaffold bracket which may be readily folded when not in use and which will be positively held against possible collapse while being used. I

With the foregoing object in view, the inventionresides in the novel construction and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings. 7

Figure 1 is a perspective view illustrating a pair of my improved scaffold brackets supported on the side of a building, a board or platform, on which one or more workmen stand, being shown in broken lines Fig. 2 is an enlarged vertical sectional view illustrating the gearing and other mechanism whereby the platform is raised and lowered;

Fig. 3 is a horizontal sectional view along the line 33 of Fig. 2. p

Referring to these drawings in detail, in which similar reference characters correspond with similar parts throughout the several views, a wall ofa building'is represented by the numeral 5, the samebeing constructed of boards 6 which are secured on the usual studs 7 by any ordinary means.

A plurality of cleats or inwardly flanged securing elements 8 are secured to the vertical surface of the wall 5 by means of nails or spikes 9 which extend through apertures 10 of the cleats into the wall, and preferably into the studs 7. For this purpose I prefer employing casing nails, as such casing nails have tapering heads which project beyond the apertures 10 sufficiently to enable a workman to engage the same with a claw-hammer or other device so as to withdraw the nails when it is desired to remove the cleats. Each Specification of Letters latent.

Patented J une 24, 1919.

of the'cleats 8 is provided with two vertically extending rows of apertures 10, so that ifone of these apertures should register with a crack, knot or knot hole, 'the nails may be placed in other apertures-10 so as to obtain the most secure anchorage for the nails.

Each of the cleats 8 is formed with a transverse slot which has outwardly converging walls, sothat flanges'll are formed at opposite sides of the groove and extend inwardly toward one another. In other words, cleats 8 are formed with dovetail grooves, and these grooves are vertically alined when the cleats are arranged as shown in Fig. 1. YA plurality of vertically alined beams 12 are eachformed with a pair of opeach beam 12 is preferably formed with a rack 15, although the racks 15 may be formed separately and secured on the beams 12 if desired. 7 The outwardly extending flanges 13 are normally seated. within the dovetail grooves of the cleats 8, so that the flanges Hand 13 cooperate for preventing disengagement of the beams from the cleats by a lateral movementof the beams, but allowing longitudinal movement of the beams,

the beams. Each ofthe cleats is sufliciently wide'to securely engage the meeting ends of the two beams 12 (and secure them in alinement with one another as illustrated at 16 in Figs. 1 and 2.

, Although in practice it may be foundeX- pedient to form all ofthe cleats alike, and to form all of the beams12 alike, the present drawings disclose the lower beams 12 as eliminating the gear-rack-teeth from the lower part thereof, as the same are not nec- .essary where they are shown eliminated.

-Moreover, although it is contemplated that the cleats and beams shallbe relatively movable asa rule, I may secure the lower cleats .to the lower end ofthe lower beams 12, or I may provide each lower beam 12 with a lug '17 which prevents downward movement of this beam with relation to thelower cleats, or I may allow the lower beam 12 to rest .uponthe ground or upon any other support (not shown).

For supporting a scalfold board or platform, I provide a plurality of vertically positely extending flanges 13 and 14, and

or movement of the cleats longitudinally of I hook 26 thatnehgages'with a bolt or pin.

ing pivotally connected at 21 to a pair of depending lugs 22 i which are preferably mortised into the outer "end of the beam 18 or otherwise secured to the latter The lower end of the beam is preferably pro-1f vided with strips 23 which are secured on opposite sides thereof and extend'beyond its lower end, said lower end'beingnorma-lly seated in a recess 2 1 formed in the lower end portion of thevertical beam 19. The upper end of the beam 119 is provided with a metal strip 25' which is formed with a 27. "This bolt or pin extends horizontally througha recess 28which is formed-in the lower sideofthe beam 18. The hook 26 may be-=disengaged from the bolt; 27 and the beam 19 may be disengaged from the beam v 20 so as s to allow.'t-hefllatter to be folded into parallelrelation with the beam 18 when it is desirable to knock-down. .the device; but when in the assembled relation shown in Fig. 1, these elementslS, 19 and 20 form a triangularbracket which is supported by means 01 the adjacent rack 15 and'the 'co j operatinggear'mechanlsm and casmgwlnchwill now be described. I l

A'Jgear casing 29 rises from and is securely united with each b'eam'18'by means of screws 30 or other appropriate means. A'gear wheel 31 meshes with'the rack 15 and is rotatable onan aXle 32 which is supported by the casing 29; A gear wheel 33 meshes with the gear wheel 31 and with a worm 34' which is j ournaled in the top and bottom of the casing'and has its top portion squared, as indicatedat 35 for the reception of a crank '36 orother means whereby the worm 34 may 'berotated Obviously the wheel could be dispensed with, and the worm '34 caused to mesh with the wheel 31; but the interposition of the wheel 33 enables the worm 34 to be located a sufficient distance from the rack'15gto allow the crank 36 to have free play. 1 rotating thecrank 36 in one direction, the be'am 18 and its adjuncts will be raised, "and by rotating it in the oppositedirection," these elements will be lowered. It will be seen that tliepitcli of the worm34 is such that any tendency of the wheel 33 to turn is offset by the engagement of its teeth with" the threads of the worm 34, so thatit is impossible for the beam 18 and its adjuncts to beacci'dentally lowered. 1 In order that the casing may be prevented from moving outward or'laterally with relationto thebeam or beams 12, the same is provided with. inwardly extending flanges This construction allows the c-asupwardly until the entire bracket is removed from the track.- Such upward swinging of the bar. 18' is required to remove the lower end of-the brace 20rfrom the socket -ornotch 24:, and it will thus be seen that this brace cannot'be accidentally disengaged from the socket while the devicegis in use. w I

Although I havedescribed this embodiment of my invention very specifically, it is not intended to limit the invention to these exact details of construction and arrangement of parts, but I-am entitled to 'make 'changesvwithin the scope ofthe inventive idea disclosed in the foregoingdescription' I and following claim. 7

What I claim as my invention is: p I In a vertically adjustablefoldable s'cafi'old bracket, a vertica'l track having rack teeth, a vertical bar (contacting {slidably with the toothed side of said track, a horizontal bar pivoted at one endto the upper end of said verticalf bar and adapted }to support a scaffold board,;an"inclined brace-bar pivoted at its upper end to the other end of said horizontal bar, the lower end of said vertical bar having a socket in which the lower end *Of'SMCl brace bar is'received, sa d brace bar being removable from said socket when said 'horizontalbar-is swung upwardly; a

gear case rigidly mounted on and rising 'from said horizontal bar, said gear case having guide means slidable along said track, a gear in said case meshing wlth said rackteeth, and means for rotatmg said gear to adjustthe' bracketvertically along the track, said guidemeans and said gear coacting with said track to prevent upward swinging of said horizontal bar. until the bracket is removed from the track and consequ'ently preventing accidental removal of "said brace bar from said socket.

In testimony whereof I have hereunto set my hand. 7 v v p I YEAGLEY.

Copies of this gatent'may be obtained for five cents each, byaddressing the Commissioner of Patents, :1 Washington. 1).0. I 

